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. 2014 Aug 15;4:6075. doi: 10.1038/srep06075

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(a,b), Transport mean free path ℓ_t as a function of filling fraction f of the chitin random network and scale thickness t calculated by equation 1 using measured τ-values, for Cyphochilus and L. stigma, respectively. The black areas correspond to unphysical solutions. ℓ_t is smaller than 5 μm in the relevant f and t range. (c,d), Corresponding variation of ℓ_t with f for fixed t (t = 8.1 μm and t = 13.7 μm for (c,d), respectively). The grey and black symbols correspond to the predictions of equation 1 and 2, respectively. The crossing points provide estimates of ℓ_t and f, delimited by the confidence range indicated by dashed lines.